ci: pin action-semantic-pull-request to commit SHA (v6.1.1) (#27)

Fixes code scanning alert #2 (actions/unpinned-tag, CWE-829).


Claude-Session: https://claude.ai/code/session_01PeTTGDtZZU6FhTvjCePKtX

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: ckivisild-elnora-ai

.github/workflows/pr-title.yml

@@ -22,7 +22,7 @@ jobs:
     name: Conventional Commit
     runs-on: ubuntu-latest
     steps:
-      - uses: amannn/action-semantic-pull-request@v6
+      - uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6.1.1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with: